Spatial variation of seismicity parameters across India and adjoining areas |
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| Authors: | Sreevalsa Kolathayar T G Sitharam and K S Vipin |
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| Institution: | (1) Department of Civil Engineering, IISc Bangalore, Bangalore, 560012, India;(2) Department of Civil, Mining and Environmental Engineering, University of Wollongong, Wollongong, NSW, Australia |
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| Abstract: | An attempt has been made to quantify the variability in the seismic activity rate across the whole of India and adjoining
areas (0–45°N and 60–105°E) using earthquake database compiled from various sources. Both historical and instrumental data
were compiled and the complete catalog of Indian earthquakes till 2010 has been prepared. Region-specific earthquake magnitude
scaling relations correlating different magnitude scales were achieved to develop a homogenous earthquake catalog for the
region in unified moment magnitude scale. The dependent events (75.3%) in the raw catalog have been removed and the effect
of aftershocks on the variation of b value has been quantified. The study area was divided into 2,025 grid points (1°×1°) and the spatial variation of the seismicity
across the region have been analyzed considering all the events within 300 km radius from each grid point. A significant decrease
in seismic b value was seen when declustered catalog was used which illustrates that a larger proportion of dependent events in the earthquake
catalog are related to lower magnitude events. A list of 203,448 earthquakes (including aftershocks and foreshocks) occurred
in the region covering the period from 250 B.C. to 2010 A.D. with all available details is uploaded in the website . |
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